Heat oven to 180 degrees Celsius (360 Fahrenheit)
Grease a baking dish, I use a quick spray of oil
Slice banana, lay the slices in the bottom of the dish
Cover the banana with the oats
Whisk together milk, eggs, honey, vanilla, and cinnamon
Pour the wet ingredients over the oats
Scatter the blueberries on top
Pop into the hot oven and bake for 20-25 mins (until the oats have absorbed the liquid)
Serve as is, or with a little extra milk or yoghurt. You can either scoop it, or if you leave it to cool a little you will be able to slice it.